      function formatTime(date) {
         var year = date.getFullYear()
         var month = date.getMonth() + 1
         var day = date.getDate()
         
         var hour = date.getHours()
         var minute = date.getMinutes()
         var second = date.getSeconds()
         
         return [year, month, day].map(formatNumber).join('-')
          // + ' ' + [hour, minute, second].map(formatNumber).join(':')
        }
        function formatNumber(n) {
            n = n.toString()
            return n[1] ? n : '0' + n
          }

        module.exports = {
          formatTime: formatTime
        }